Trumpet anemone

''Aiptasia mutabilis'', also known as the trumpet anemone, rock anemone, and glass anemone, is species of anemone typically found attached to substrates in cold waters of the Atlantic. Its unique trumpet shape gives it its common name and it can grow to be 12 cm,having a column between 3 to 6 cm in size. Like many cnidarians, they rely on nematocysts for protection and to capture prey. ''A. mutabilis,'' are not difficult to care for, and can be kept in a home aquarium, although due to their speed of reproduction, can quickly become overpopulated.